For machinery



(No Model.)

R. P. M. CHASE.

BELTING SOR MAGHINBRY. No.336,99.0.

Patented Mar. 2, 1886-.

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RICHARD F. M. CHASE, OF NEW YORK, N. Y.

BELTING FOR MACHINERY.V

SPECIFICATION forming part of Letters Patent No. 336,990, dated March 2,1,886. Application filed February 2., 1885. Serial No. 154,650. (Nomodel.)

T 0 @ZZ whom, it' may concern.-

Beit known that I, RICHARD F. M. CHAsE, of New York, in the State of NewYork, have invented certain new and useful-Improvements in Belting forMachinery, of which the following is a specification.

My invention has for its object the production of a belt having'eitherone or both sides concave, adapted to fit crowning pulleys, one or bothsides convex to t concave orgrooved pulleys, and fiat belts havinggreater strength at the edges, where the most wear and tear as well asstrain come.

My improvement maybe applied to any knit or woven fibrous belt, whethercovered with vulcanized rubber or other suitable material or leftuncoated; :but it more especially applies to the belting described andclaimed in United States Letters Patent No. 306,131, granted to meOctober 7, 1884.

My invention consists in using warp-threads of varying size. These arenot necessarily used with a uniformly-diminishing size; but preferablythey would be so arranged.

In constructing a belt with a double-concave section, which form isadapted to fit a crowning pulley using either side of the belt, thewarps would gradually diminish in diameter from the edges toward thecenter. The largestsize warp-threads are thus placed in the edges of thebelt, where the most strength is required, and where the belt is mostliable to eXtra strains and injuries. In the case of a seamless tubularknit fabric, which is the best way of making these belts, beginning atone side, the warps will preferably gradually diminish in size upon eachside of the largest warp-threads until the half the circumference of thetube is reached, when they willincrease upon each side until they meetin the maximum warps opposite vthose at the starting point. Forconvenience in folding the tube into a flat belt or band, the warps atthe portions of the tube that are intended to form the edges ofthe beltmay be somewhat smaller than those immediately adjacent upon eitherside. In the case of a doubly-convex belt, thelargest warps would be inthe center, and in the case of a belt flat upon one side the warps uponone-half of the tube maybe of a uniform size.

It is obvious that a tube knit for a doubly-'- concave belt may be usedfor a doubly-convexH threads in the center line'of the belt, instead ofat the edges.

In the drawings, Figure l is a cross-section of my improved belt, inwhich both sides are concave. Fig. 2 is a cross-section of my improvedbelt, in which only one side is concave, the other being fiat. In bothsections the belt is shown coated with india-rubber or other suitablecompound ou the outside, as well as between the layers of knit or wovenfabric; but, if desirable for any reason, the outer coating may beomitted. Fig. 3 is a section of this form of belt in which both sidesare flat and parallel, one end being shown square and one rounded. Fig.4 is a cross-section of a form of myimproved belt, in which the rubberis used only in the center, the outside of the belt being leftuncovered.

a a are the warp-threads. b is the weft of knit or woven fabricindicated by section-lines. C is india-rubber or other material formingthe outer coating. d is the layer of india-rubber or other suitablematerial between the two sides of the knit tube on the inside. Thewarp-threads are seen to diminish in size from the edges toward thecenter, and may be, as shown, a little smaller at the edges where theturn is made, though this is not absolutely essential.

The belt having one flat face and one con cave may be produced by merelypressing into shape, by adding more rubber on one side and pressing, orby making the warp-threads on one side all of a size. A belt having bothfaces flat and parallel may also be produced by adding more rubber andpressing or rolling into shape. Y

The advantages of this form of fiat belt over the ordinary flat beltare, that its edges are much stronger, and its center being moreyielding it will also conform to crowning pulleys.

The advantages of my improved belting when made with one or both sidesconcave are, that it ts a crowning pulley exactly, and its edges arevery much stronger in proportion than the center, rendering the beltmore lasting. By putting the small warp-threads on IOO the edges and thelarger ones in the center of i warps of varying size graduated toconform to 2o the belt it may be adaptedto conform'to hollow pulleys;but in this case the advantage of having stronger edges would of coursebe lost. In this kind of belt, however, it is not so im portant to havethe edges strong.

Having now fully described my invention, what I claim, and desire tosecure by Letters Patent, is-

1. Knitorwovenbelts or bandshaving warpthreads of graduated sizes andall of one series, as described, and for the purpose set forth.

2. Belting for machinery, made of a circular seamless knit or woven tubeor tubes, with warps of different sizes graduated to conform to acrowning or concave pulley, rolled or pressed together in the forni of abelt or band. 3. Belting for machinery,made of a circular seamless knitor woven tube or tubes, with acrowning or concave pulley, in combinationwith vulcanized rubber or other suitable compound, and rolled or pressedtogether in the form of a belt or band.

4. Belting for machnery,made of a circular seamless knit or Woven tubeor tubes, with Warps of graduated size, in combination with vulcanizedrubber or other suitable material, so placed and pressed or rolled as tomake the section of the belt rectangular,or with parallel faces androunded ends, substantially as shown and described.

In witness whereof I have hereunto set my hand.

RICHARD F. M. CHASE. Witnesses: H. WHITE,

N. V. QUIEN.

